Heating plug



Dec. 3, 1940.

R. .-A. SlEGL-'ER HEATING PLUG Filed Juljy'ssa, .1938

INSU LATIUN Patented Dec. 3, 1940 UNITED STATES yPATENT OFFICE HEATING PLUG Richard A. Siegler, Oak Park, Ill.

Application July 9, 1938, Serial No. 218,372

7 Claims.

This invention relates to a heating plug and particularly to that type of heating plug which may be used in connection with a' hot water bottle or other liquid container so as to heat the container and its contents.

It has for one object to provide a device of the type indicated which is simple in construction and economical in operation.

Another object is to provide such a device so arranged that it can be readily assembled, and in case of damage or wear can be readily repaired.

Another object is to provide the device indicated so arranged that the heating element itself is shielded from the liquid but circulation of the liquid past the heating element is provided, and hence more eiiective heating of the fluid is accomplished.

Other objects will appear from time to time in the course of the specication and claims.

The invention is illustrated more or less diagrammatically in the accompanying drawing, wherein: f

Figure 1 is a side elevation;

Figure 2 is a longitudinal section on an enlarged scale taken at line 2-2 of Figure 1; and

Figure 3 is a transverse sectional detail taken at line 3-3 of Figure 2.

Like parts are indicated by like symbols throughout the specication and drawing.

I indicates generally the body of the housing of the device and as shown it is preferably made of insulating or non-conductive material. It may be threaded at its upper margin as at 2 to receive a correspondingly threaded enclosing member 3, which may be reduced as at 4 if desired, and perforated as at 5 to permit the conduit B to pass through it.

The member I is preferably provided with a hollow portion 'I within which are located some or all of the electric connections. As illustrated herewith, three -thermostatic elements 8, 9 and I0 are shown, one or another of which may be connected to the central contact member II. Wires I2, I3 and I4 are connected with the thermostats 8, 9 and I0 respectively. The details of the thermostatic arrangement form no essential part of the present invention and will not be more fully described. The invention relates more particularly to the construction of the device rather than to the electrical connections and might be vapplied equally well to an apparatus which did not have any thermostatic arrangement.

The body I is provided with a reduced extension I5, which is exteriorly threaded as at I6 if desired, and is provided with a hollow portion I1.

Preferably molded in the extension I5 and lining a portion of the hollow I1 is a cap or closure member I8 which at its upper end has a laterally extending flange I9 which is engaged in the body of the material which forms the part I. As indicated, it is preferably molded in that manner. It is closed lat its outer end by the integral bottom portion 20. The body I5 is hollowed out as at 2 I. A shell 22 lies within the hollowed out portion and may, as indicated in Figure l, extend into lo the body of the member I5. It is preferably perforated as at 23, 23 and its end is open as at 24. As indicated, it is positioned about the cap member I8 and extends downwardly beyond it, but because its end is open and because it is provided 15 with a plurality of perforations 23, iluid may circulate freely inside the member 22 and between it and the cap I8 and about the latter.

A supporting member 25, which may be of insulating material, is supported upon the par-t II 20 and extends downwardly through the cavity II and into the cap member I8. Fixed upon it is an enlarged supporting member 26. A wire 21 leads from the contact member I0 and is wrapped about the support 26 as shown. This wire forms 25 the heating element. At its other end it passes upwardly and is connected as at 28 to an incoming wire 29.

Nothing is shown of the details of the wiring mechanism and these details form no part of thev 30 present invention, which may be embodied in any construction in which means are provided for a heating element and suitable electric connections to bring current to that element.

I claim:

1. In a heating plug, a body portion, a cavity formed in said body portion, and a closed cap member in communication with said body portion and extending outwardly beyond the said body portion, an annular end extension of insulating 40 material formed on said body and extending outwardly along and spaced away from said cap, and a hollow shell positioned partially within said body, partially within said annular extension, and extending outwardly beyond said cap, said shell having its exposed end open and being perforated, and a heating element positioned within said cap.

2. In a heating pluga body portion, a cavity formed in said body portion, and a closed cap member in communication with said body portion and extending outwardly beyond the said body portion, `an annular end extension of insulating material formed on said body and extending outwardly along and spaced away from said cap, and a hollow shell positioned partially within said body, partially Within said annular extension, and extending outwardly beyond said cap and beyond said extension, said shell being perforated in its side and having an open end, and a heating element positioned Within said cap.

3. In a heating plug, a body portion formed of insulating material, said body portion shaped to provide an internal cavity, electrical connection members positioned within said cavity, an additional longitudinal cylindrical cavity formed in said body portion and communicating with said rst mentioned cavity, and a closed cap member in communication with said body portion and extending outwardly beyond the said body por tion, an annular end extension formed on said body and extending outwardly ralong and spaced away from said cap, and a hollow shell positioned partially within said body, partially within said annular extension, and extending outwardly beyond said cap, said shell being freely perforated in its side with a plurality of perforations and having an open end, and a heating element positioned within said cap,

4. In a heating plug, a body portion, electrical connections extending thereinto, `a closed shell joined to and extending outwardly beyond said body portion, a heating element therein, and a second member positioned about and spaced away from said rst mentioned shell extending outwardly beyond its end, and providing about it an annular circulation space, a plurality of openings in said second member, said shell and said second member extending from said body portion a distance less than the length of said body portion.

5. In a heating plug, a body portion, electrical connections, a closed shell joined to and extending outwardly beyond said body portion, a heating element therein, and a second member positioned about and spaced away from said irst mentioned shell extending outwardly beyond its end, and providing about it an annular circulation space, and openings in the sides ,and in the end of said second member, said shell and said second member extending from said body portion a dista-nce less than the length of said body portion.

6. In a heating plug, a body portion, electrical connections, a closed metallic shell joined to and extending outwardly beyond said body portion, a heating element therein, and a second metallic member positioned about and spaced away from said first mentioned metallic shell and extending inwardly beyond its end, and providing about it an annular circulation space, openings in said second member, said shell and said second member extending from said body portion a distance L less than the length of said body portion.

7. In a heating plug, a body portion, electrical connections, cavities formed therein, a closed shell joined to and extending outwardly beyond said body portion a distance less than the length of said body member, a heating element therein, the inside of said shell in communication with one of said cavities, and a second member positioned about and extending inwardly beyond the end of and spaced away from said iirst mentioned shell, and providing `about it an annular circulation space, and openings in the sides and in the end of said second member, said shell and said second member extending from said body portion a distance less than the length of said body portion.

RICHARD A. SIEGLER. 

